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I created a web app called MathCity.
In it, children can build their own city by solving math problems and taking part in competitions, for which they earn in-game currency.
This helps turn the sometimes boring process of learning into an exciting game.
The ability to share their progress with other users motivates children even more to return to the app more often and keep learning.
They can also buy in-game avatars to stand out from others or simply collect them.
https://mathplay-41632.bubbleapps.io/version-test/
The network for creativity
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I Built an AI-Powered Quiz Platform in 3 Day Using Only My Phone. The Odds Were (and are) Against Me.
Meet Aicai Quizzes by CFMoon, a quiz creation and exploration platform I built in just three days.
🔗 Try it here: https://aicai.cfmoon.net
Aicai lets you generate quizzes with AI, share them with others, and automatically grade answers using AI, especially useful for open-ended and paragraph-length responses.
But the interesting part isn't just what I built. It's how I built it, and under what circumstances.
1. Building from outside the usual startup ecosystem
I'm not based in the US or another major tech hub. That means dealing with a different set of constraints, from limited access to payment infrastructure like Stripe to fewer opportunities, no access to GoFundMe, Kickstarter, or startup funding and other resources that developers in more privileged ecosystems often take for granted.
Building software is global. Access to the infrastructure surrounding it isn't always so convenient.
2. One person, one laptop, one phone, and AI
I did this entirely on my own.
No co-founder, no team of developers, no marketing department, and no established professional network to lean on. Just my experience as a software engineer, AI tools, and the hardware I already had: an aging laptop and a smartphone.
3. I built Aicai using only my phone. Yeah, why not use my computer? With the little time I have each day, it is hard to sit down and code, so I built it on the go, while on the street, connecting to public WiFi, all while running my already strenuous life.
AI didn't replace my engineering experience. It amplified what I could do with the resources available to me, and it really made the whole thing easier.
4. Almost no runway
I had very little money left to work with. This wasn't a project backed by investment or a comfortable financial cushion.
The Lovable free trial, made possible through Contra Challenges and Lovable, gave me the opportunity to build and ship the product without spending money I couldn't afford to spend.
A big thank-you to both for making that possible.
5. Building while technically homeless
There's one more detail worth mentioning: I'm currently living in a hotel and paying for accommodation by the day.
In other words, I built and shipped a software product while dealing with housing insecurity and the uncertainty that comes with it.
It's very difficult, and I wouldn't recommend it.
Why I'm proud of Aicai
The platform was built with proper software engineering practices and attention to code quality, maintainability, and reliability. Whop, a great platform, handles payments checkout, and Lovable Cloud handles users, registrations and AI features, which I hope to get enough runway to keep it online.
Three days is a short development window, but shipping something meaningful in that time takes more than prompting an AI to generate an application. It takes knowing what to build, making architectural decisions, evaluating the output, and getting the product ready for users, all while dealing with an already difficult life.
Aicai is a small product, but it's also a demonstration of what's possible when willpower beats the odds. That's where my experience as an engineer and tinkerer mattered, I could do it under pressure, under actual constrains and difficulties, and no degree will ever teach you that, only life.
No funding round. No team. No fancy setup. No rich uncle. Just an idea, the skills to execute it, and the willingness to make something with what I had.
This is what I'm building at CFMoon: useful software, built with professional expertise and quality in mind, always.
Explore Aicai: https://aicai.cfmoon.net
I built this project to test Pixel studio with a playable COIN DASH arcade cab. Spriteworks is a tiny studio making pixel-perfect games with heart. Play our catalogue, meet the team of two, and press start. The core engineering challenge was sustaining uncompromised 60 FPS rendering using Canvas2D while handling continuous user interaction without framework overhead.
WHAT I WAS TESTING:
I focused on two core engineering benchmarks:
Precision implementation of pixel art under continuous interactive user input
Sustained 60 FPS render performance and zero-dependency browser execution
THE TECHNICAL SIDE:
Engineered directly in the browser with Canvas2D, Pixel art. The application runs without third-party frameworks or build-step dependencies, using hardware-accelerated rendering and custom event loops to achieve zero-latency response.
Everything executes in the browser using Canvas2D, Pixel art. No third-party frameworks, no heavy runtime bundles, and zero external tracking.
WHAT I LEARNED:
Balancing the mathematical rigors of pixel art with tactile browser interaction required tuning event throttling and memory allocation to eliminate all garbage collection stutters.
Finding the sweet spot between mathematical precision and frame budget took careful profiling, but the result runs at a steady 60 FPS even on modest hardware.
TRY IT YOURSELF:
The live build is deployed on my JSFiddle. Open it in your browser, test the controls, and observe the render response times.
If you are building high-performance 3D, physics, or creative web systems and want to collaborate, reach out here on Contra.
Very professional.
I designed a modern court booking web app that simplifies scheduling into a direct, low-friction flow. As "vibe-coded" pickleball sites flooded the local market, many suffered from bad UX disguised as fast builds—garbage inputs leading to broken user journeys. SmashHub needed to stand out from day one, using a polished front-end booking flow to reduce customer acquisition friction while giving owners an enterprise dashboard for court allocation, payments, and real-time business analytics.
Great work 👍🏻